Talking-machine sound-box.



T. F. JONES.

TALKING MACHINE SOUND B0X` APPLICATION min JULY 2.1911.

' INVENTOR.

ATTORNEYS.

Patented Mam, 1918.. l

reruns ourson,

THE'AS l?. JONES, OF ML'XWOOD, ILLINIS.

TALKING-MAHINE SUND-BOX.

Specieetiono' Letters Eatcnt.

rateneeu Mar. 5, reis.

Application led July 2, 1917. Serial t'l'o. 175,165.

To all wwm t may concern.'

Be it known that I, THOMAS F. JON-ns, a citizen of the United States,residing at Maywood, in the county of Cook and State of illinois, haveinvented new and useful Improvements in Talking-Machine Soundoxes, ofwhich the following is a specification.-

This invention relates to sound boxes of talkin@ machines, and itsobject is to provide a. noveland improved mountinv therefor whereby itis :tree .to rotate about its own axis .rather than swing bodily aboutan axis outside of itself, this arrangement resulting in certainadvantages to be hereinafter pointed out.

In order that the invention may be better understood, refer e is had tothe accompanying drawingibamiga part of this specification and in saiddrawing,

Figure l is a side elevation of a fragment of the tone arm ot a talking.machine and the sound box carried thereby;

Fig. 2 is a plan view thereof;

l? ig. 3 is a section on the line 3 3 of Fig. 2, and I Fig. e is asection on the line 4-4- of Fig, l.

Referring speciiically to thedrawing 5 denotes the tone arm of a talkingmachine having at its outerend a yoke, .the branches 6 or which openinto central apertures 7 in the oppositeside walls 8 of the sound box.Between the walls 8 und extremities of the yoke branches 6 areinterposed felt Washersv- 9 to retain the sound and to absorb jur. Thesound box is in two sections formed by the walls 8 and the diaphragm 10is held therebetween by rubber clamping rings 1l. rl`he diaphragm 1G hasthe usual connections l2 with the stylus holder 13. 0n the .sound bokare ears lll carrying pivot screws which engage. the trun'nions l5 onthe stylus holder.

The sound box is supported by two arms i6 pivoted at 17 to the yokebranches 6.

As shown in Figs. 2and e of the drawing ,the outer ends of the yokebranches 6 have inward bends coinciding with the center of the soundbox, between the ,Xtrein1t1esl oi which bends the sound boX 1s located.-The pivots 17 of the arms 16 coincide with the axis of the bends of theyoke branches and are therefore in the center line of the sound boX.Hence it will be seen that the sound bon is rotatably supported on anaxis coincidingwith its center', and it does not swing bodily about apivot outsidey of itself as in the conventional types of talkingmachines, causing the record disk to bear the weight of the sound box.By supporting the sound box so that it can turn about its owiraxis,

volume of sound and musicalovertones, and

surface friction or scratching is reduced to a minimum. The weight ofthe sound box may be increased, thereby forcing all vibra-.

tions to the diaphragm.V The compensation of the sound boX is axialinstead of radial, that is to say, the l,compensation is secured by thesound box turning upon an' exis the center of which passes through thecenterf of the diaphragm. This method of suspension of the sound loonwill allow. or compensate for inequalities in 'the record disk, or themotion of the turntable carrying the latter. Sound boxes having a radialsuspension also do this, but with less eihciency, for the reason that bya radial suspension more Weightiis placed on the needle. `The lightpressure on the needle resulting from the axial vsuspension or the soundbox will more readily absorb the inequalities hereinbefore mentioned, orcompensate for them.l

Icleim:

l. rlhe combinationfwith a talking machine tone arm having laterallyextending, branches at its outer ends 'terminating in inward bends; of asound box rotatably positioned between the extremities of said bends,and peir of supporting erols connested t'o opposite sides of the soundbox and pivoted to the aforesaid branches in line with the center of thesound boX.

2. .The combination With va talking ma- 5 chine tone arm havinglaterally extending branches at its outer ends; of a sound box rotatablylocated between said branches, and

supporting arms for the sound box fastened to the latter on oppostesidesthereof and pvotally connected to the .aforesaid branches' 1o in linewith the center of the sound box. f

In testimony whereof I aix my signature.

THOMAS F. JONES.

